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聽聽聽 鍦↗AVA涓紝閫氳繃Class.forName()鏂規硶鍙互鍔ㄦ佸喅瀹氬姞杞藉摢涓涓被錛岃繖涓姛鑳藉浜庣浉鍚屾帴鍙g殑涓嶅悓瀹炵幇鏉ヨ闈炲父鏈夌敤銆傛瘮濡傚浜庤璁″ソ鐨勬暟鎹簱榪炴帴姹犳帴鍙o紝鎴戜滑鍙互鏈夊縐嶇殑鎺ュ彛瀹炵幇綾繪潵瀹屾垚鐩稿悓鐨勫姛鑳斤紝鍚屾椂鐢ㄦ埛鍙互綆鍗曠殑閫氳繃淇敼閰嶇疆鏂囦歡鏉ユ寚瀹氬疄闄呬嬌鐢ㄥ摢涓涓疄鐜扮被錛屽湪婧愪唬鐮侀噷闈㈤氳繃璇誨彇閰嶇疆鏂囦歡淇℃伅錛屽茍鐢?font style="BACKGROUND-COLOR: #ffff00">Class.forName(configClassName).getInstance()灝卞彲浠ユ瀯閫犱竴涓壒瀹氱殑瀹炵幇綾誨疄渚嬶紝鑰屼笉鐢ㄦ瘡嬈′慨鏀規簮浠g爜銆傝繖鏍峰浜庣▼搴忔潵璁插彧鐢ㄥ叧蹇冩帴鍙g殑瀹氫箟錛岀敤鎴峰彧鐢ㄨ繘琛岄厤緗枃浠剁殑璁劇疆灝卞畬鎴愪簡鍚屼竴鍔熻兘鐨勪笉鍚屽疄鐜扮殑鍒囨崲銆?br />浣嗘槸濡傛灉瀹炵幇綾婚渶瑕侀氳繃闈欐佹柟娉曟潵榪涜鍒濆鍖栫殑鏃跺欙紝鍔ㄦ佸姞杞界殑榪囩▼灝變細澶嶆潅涓浜涖傚悓鏍風殑浠ユ暟鎹簱榪炴帴姹犱負渚嬶紝閫氬父榪炴帴姹犵殑鏋勯犲嚱鏁伴兘浼氳瀹氫箟涓虹鏈夌殑錛岃岄氳繃鑷畾涔夌殑getInstance()闈欐佹柟娉曟潵寰楀埌鍞竴瀹炰緥銆傝繖縐嶆儏鍐典笅綆鍗曠殑閫氳繃Class.forName().getInstance()灝辨棤娉曟紜瀯閫犲疄渚嬨?br />騫稿ソJAVA鎵鎻愪緵鐨勫弽灝勬満鍒?Reflection)涓烘垜浠彁渚涗簡瀹屾暣浜嗘帰鎮夌被鍐呴儴緇撴瀯鐨勬柟娉曘傞氳繃鍙嶅皠鏈哄埗錛屾垜浠兘澶熷畬鎴愬熀鏈笂鎵鏈夌殑榪愯鏃跺喅瀹氱殑鍔ㄤ綔(铏界劧榪欎竴瀹炵幇瑕佹瘮鍏朵粬鍔ㄦ佽璦錛屾瘮濡侾HP錛岀殑eval()鐨勪嬌鐢ㄨ澶嶆潅鐨勫)銆?
涓嬮潰閫氳繃瀹為檯鐨勪緥瀛愯鏄庡浣曞湪榪愯鏃跺姩鎬佽闂被鐨勯潤鎬佹柟娉曘?br />-------------------------------------------------------
*/
import
java.lang.reflect.
*
;
public
class
myTestClass{
聽聽聽聽privatestatic Object pLock =new Object();
聽聽聽聽privatestatic myTestClass p_instance =null;
聽聽聽聽private String s_configName ="";
聽聽聽聽privateboolean b_isFromResource =true;
聽聽聽聽publicstatic
Object getInstance(String sConfigName,
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽Boolean bIsFromResource){
聽聽聽聽聽聽聽聽synchronized(pLock){
聽聽聽聽聽聽聽聽聽聽聽聽if(null==
p_instance){
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽p_instance
=
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽new
myTestClass(sConfigName,bIsFromResource);
聽聽聽聽聽聽聽聽聽聽聽聽}
聽聽聽聽聽聽聽聽}
聽聽聽聽聽聽聽聽return
p_instance;
聽聽聽聽}
聽聽聽聽private
myTestClass(String sConfigName,Boolean bIsFromResource){
聽聽聽聽聽聽聽聽s_configName
=
sConfigName;
聽聽聽聽聽聽聽聽b_isFromResource
=
bIsFromResource.booleanValue();
聽聽聽聽}
聽聽聽聽publicvoid
echoInfo(){
聽聽聽聽聽聽聽聽System.out.println(
"
current arguments : configName=[
"
+
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽s_configName
+
"
],isFromResource=[
"
+
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽b_isFromResource
+
"
]
"
);
聽聽聽聽}
聽聽聽聽publicstaticvoid main(String[] args) throws Exception{
聽聽聽聽聽聽聽聽// 璁劇疆鏂規硶鐨勪紶鍏ュ弬鏁扮殑綾誨瀷.
聽聽聽聽聽聽聽 Class[] parameterTypes =new
Class[]{
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽java.lang.String.
class
,
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽java.lang.Boolean.
class
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽};
聽聽聽聽聽聽聽聽Method mGetInstance
=
null
;
聽聽聽聽聽聽聽聽String className
=
"
myTestClass
"
;
聽聽聽聽聽聽聽聽Class curTestClass
=
Class.forName(className);
聽聽聽聽聽聽聽聽try
{
聽聽聽聽聽聽聽聽聽聽聽聽mGetInstance
=
curTestClass.
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽getMethod(
"
getInstance
"
,parameterTypes);
聽聽聽聽聽聽聽聽}
聽聽聽聽聽聽聽聽catch
(NoSuchMethodException e){
聽聽聽聽聽聽聽聽聽聽聽聽e.printStackTrace();
聽聽聽聽聽聽聽聽聽聽聽聽mGetInstance
=
null
;
聽聽聽聽聽聽聽聽}
聽聽聽聽聽聽聽聽if(mGetInstance !=null
){
聽聽聽聽聽聽聽聽聽聽聽聽myTestClass pObj
=
(myTestClass)
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽mGetInstance.invoke(
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽null,
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽new Object[]{
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽"src/myconfig.properties"
,
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽Boolean.FALSE
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽}
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽);
聽聽聽聽聽聽聽聽聽聽聽聽pObj.echoInfo();
聽聽聽聽聽聽聽聽}
聽聽聽聽聽聽聽聽else{
聽聽聽聽聽聽聽聽聽聽聽聽throw
聽聽聽聽聽聽聽聽聽聽聽聽new Exception("myTest Init Failed from class"+
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽className
+
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽System.getProperty(
"
line.seperator
"
,
"
\n
"
)
+
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽"method getInstance(String, Boolean) exists."
);
聽聽聽聽聽聽聽聽}
聽聽聽聽}
}
聽聽

]]>
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